lnd.xprv/cmd/lncli/main.go

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// Copyright (c) 2013-2017 The btcsuite developers
// Copyright (c) 2015-2016 The Decred developers
// Copyright (C) 2015-2017 The Lightning Network Developers
package main
import (
"fmt"
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"io/ioutil"
"os"
"os/user"
"path/filepath"
"strings"
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macaroon "gopkg.in/macaroon.v2"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/macaroons"
"github.com/roasbeef/btcutil"
"github.com/urfave/cli"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
const (
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defaultTLSCertFilename = "tls.cert"
defaultMacaroonFilename = "admin.macaroon"
)
var (
//Commit stores the current commit hash of this build. This should be
//set using -ldflags during compilation.
Commit string
defaultLndDir = btcutil.AppDataDir("lnd", false)
defaultTLSCertPath = filepath.Join(defaultLndDir, defaultTLSCertFilename)
defaultMacaroonPath = filepath.Join(defaultLndDir, defaultMacaroonFilename)
)
func fatal(err error) {
fmt.Fprintf(os.Stderr, "[lncli] %v\n", err)
os.Exit(1)
}
func getWalletUnlockerClient(ctx *cli.Context) (lnrpc.WalletUnlockerClient, func()) {
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conn := getClientConn(ctx, true)
cleanUp := func() {
conn.Close()
}
return lnrpc.NewWalletUnlockerClient(conn), cleanUp
}
func getClient(ctx *cli.Context) (lnrpc.LightningClient, func()) {
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conn := getClientConn(ctx, false)
cleanUp := func() {
conn.Close()
}
return lnrpc.NewLightningClient(conn), cleanUp
}
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func getClientConn(ctx *cli.Context, skipMacaroons bool) *grpc.ClientConn {
lndDir := cleanAndExpandPath(ctx.GlobalString("lnddir"))
if lndDir != defaultLndDir {
// If a custom lnd directory was set, we'll also check if custom
// paths for the TLS cert and macaroon file were set as well. If
// not, we'll override their paths so they can be found within
// the custom lnd directory set. This allows us to set a custom
// lnd directory, along with custom paths to the TLS cert and
// macaroon file.
tlsCertPath := cleanAndExpandPath(ctx.GlobalString("tlscertpath"))
if tlsCertPath == defaultTLSCertPath {
ctx.GlobalSet("tlscertpath",
filepath.Join(lndDir, defaultTLSCertFilename))
}
macPath := cleanAndExpandPath(ctx.GlobalString("macaroonpath"))
if macPath == defaultMacaroonPath {
ctx.GlobalSet("macaroonpath",
filepath.Join(lndDir, defaultMacaroonFilename))
}
}
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// Load the specified TLS certificate and build transport credentials
// with it.
tlsCertPath := cleanAndExpandPath(ctx.GlobalString("tlscertpath"))
creds, err := credentials.NewClientTLSFromFile(tlsCertPath, "")
if err != nil {
fatal(err)
}
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// Create a dial options array.
opts := []grpc.DialOption{
grpc.WithTransportCredentials(creds),
}
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// Only process macaroon credentials if --no-macaroons isn't set and
// if we're not skipping macaroon processing.
if !ctx.GlobalBool("no-macaroons") && !skipMacaroons {
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// Load the specified macaroon file.
macPath := cleanAndExpandPath(ctx.GlobalString("macaroonpath"))
macBytes, err := ioutil.ReadFile(macPath)
if err != nil {
fatal(err)
}
mac := &macaroon.Macaroon{}
if err = mac.UnmarshalBinary(macBytes); err != nil {
fatal(err)
}
macConstraints := []macaroons.Constraint{
// We add a time-based constraint to prevent replay of the
// macaroon. It's good for 60 seconds by default to make up for
// any discrepancy between client and server clocks, but leaking
// the macaroon before it becomes invalid makes it possible for
// an attacker to reuse the macaroon. In addition, the validity
// time of the macaroon is extended by the time the server clock
// is behind the client clock, or shortened by the time the
// server clock is ahead of the client clock (or invalid
// altogether if, in the latter case, this time is more than 60
// seconds).
// TODO(aakselrod): add better anti-replay protection.
macaroons.TimeoutConstraint(ctx.GlobalInt64("macaroontimeout")),
// Lock macaroon down to a specific IP address.
macaroons.IPLockConstraint(ctx.GlobalString("macaroonip")),
// ... Add more constraints if needed.
}
// Apply constraints to the macaroon.
constrainedMac, err := macaroons.AddConstraints(mac, macConstraints...)
if err != nil {
fatal(err)
}
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// Now we append the macaroon credentials to the dial options.
cred := macaroons.NewMacaroonCredential(constrainedMac)
opts = append(opts, grpc.WithPerRPCCredentials(cred))
}
conn, err := grpc.Dial(ctx.GlobalString("rpcserver"), opts...)
if err != nil {
fatal(err)
}
return conn
}
func main() {
app := cli.NewApp()
app.Name = "lncli"
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app.Version = fmt.Sprintf("%s commit=%s", "0.4.1", Commit)
app.Usage = "control plane for your Lightning Network Daemon (lnd)"
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "rpcserver",
Value: "localhost:10009",
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Usage: "host:port of ln daemon",
},
cli.StringFlag{
Name: "lnddir",
Value: defaultLndDir,
Usage: "path to lnd's base directory",
},
cli.StringFlag{
Name: "tlscertpath",
Value: defaultTLSCertPath,
Usage: "path to TLS certificate",
},
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cli.BoolFlag{
Name: "no-macaroons",
Usage: "disable macaroon authentication",
},
cli.StringFlag{
Name: "macaroonpath",
Value: defaultMacaroonPath,
Usage: "path to macaroon file",
},
cli.Int64Flag{
Name: "macaroontimeout",
Value: 60,
Usage: "anti-replay macaroon validity time in seconds",
},
cli.StringFlag{
Name: "macaroonip",
Usage: "if set, lock macaroon to specific IP address",
},
}
app.Commands = []cli.Command{
createCommand,
unlockCommand,
newAddressCommand,
sendManyCommand,
sendCoinsCommand,
connectCommand,
disconnectCommand,
openChannelCommand,
closeChannelCommand,
closeAllChannelsCommand,
listPeersCommand,
walletBalanceCommand,
channelBalanceCommand,
getInfoCommand,
pendingChannelsCommand,
sendPaymentCommand,
payInvoiceCommand,
addInvoiceCommand,
lookupInvoiceCommand,
listInvoicesCommand,
listChannelsCommand,
listPaymentsCommand,
describeGraphCommand,
getChanInfoCommand,
getNodeInfoCommand,
queryRoutesCommand,
getNetworkInfoCommand,
debugLevelCommand,
decodePayReqCommand,
listChainTxnsCommand,
stopCommand,
signMessageCommand,
verifyMessageCommand,
feeReportCommand,
updateChannelPolicyCommand,
forwardingHistoryCommand,
}
if err := app.Run(os.Args); err != nil {
fatal(err)
}
}
// cleanAndExpandPath expands environment variables and leading ~ in the
// passed path, cleans the result, and returns it.
// This function is taken from https://github.com/btcsuite/btcd
func cleanAndExpandPath(path string) string {
// Expand initial ~ to OS specific home directory.
if strings.HasPrefix(path, "~") {
var homeDir string
user, err := user.Current()
if err == nil {
homeDir = user.HomeDir
} else {
homeDir = os.Getenv("HOME")
}
path = strings.Replace(path, "~", homeDir, 1)
}
// NOTE: The os.ExpandEnv doesn't work with Windows-style %VARIABLE%,
// but the variables can still be expanded via POSIX-style $VARIABLE.
return filepath.Clean(os.ExpandEnv(path))
}